micromillimetre /mī-krə-milˈi-mē-tər/

1. One millionth of a millimetre (now nanˈomētre; obsolete)
2. One thousandth of a millimetre (non-standard)

• pen-feather
• pen-feathered
• pen-feathers
• penfold
• penfolds
• pen friend
• pen friends
• penful
• penfuls
• penguin
• penguineries
• penguinery
• penguinries
• penguinry
• penguins
• penguin suit
• penguin suits
• pen-gun
• pen-guns
• penholder
• penholders
• peni
• penial
• penicillate
• penicilliform